In another example, the request sent at step s601 configures cell signal measurements for the mobile telephone. In this case, step s603 comprises cell signal measurements, and step s605 comprises a cell signal reporting as specified in section 5.5 of the RRC protocol standard (3GPP TS 36.331 v11.0.0).
In yet another example, an NAS UL message or an existing UE indication RRC UL message (e.g. IDC indication, DDA indication or MBMS indication) is adapted to include the D2D service indication and/or the authorisation of the on-going D2D service.
In one particularly advantageous alternative, the base station obtains indications (e.g. cell signal measurements or the like) from a plurality of mobile telephones. Using the indications obtained from multiple sources (which might also include other network entities), the base station works out whether or not there is an on-going (unauthorised) D2D service within one of its cells. In this case, parts of the D2D service indication are provided by different mobile telephones and/or network entities.